It's not known if the mother also may have been a victim of foul play, police said.

Police have doubled the reward to $5,000 for information leading to an arrest and conviction in the infant's death. People with tips can call police at 845-356-7400 or the Crime Stoppers hotline at 866-313-TIPS (8477). Police from Elmsford, Spring Valley and Westchester County say calls will be kept confidential.

Police said they've received many tips but no good leads in the case so far.